Added column for default values

Added a column after the type for indicating defaults, if there are any. Removed any mention of defaults from the comments. Also changed the indicated type of circuit-breaker-timeout to float. Note that the code indicates default values of throttled-*-upper-threshold are 0, not 100, as the command-line options docs claim.
Merge pull request #173 from ulsa/patch-5

Added column for default values